GXNet python implementation hangs on close

Dear,

The listenerThread doesn't always exit when close is called causing __thread.join() to hang infinite.

I have a situation where an an exception occurs in send on self.__socket.sendall(data) (e.g. Broken pipe on a closed connection) and close is called afterwards to clean up the connection. Here close hangs forever on the join call for the listenerThread.

This because the listenerThread gets its own reference to the socket. When close sets self.__socket to None this is not seen by the listenerThread because its own reference still points to the original socket.
The read operation on the socket returns an empty bytestream so the listenerThread doesn't stop by itself.

Regards,
Bart